Makersj lathes



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OF OTTAVA, ILLINOIS.

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T0 f//ZZ schont may concern:

Beit known that l, FDWAnD J. CHPIN, of Ottawa. in the county of La Salleand State ol" lllinois,haveinveuted a new and Improved Lathe forYil'atnh-Maltersl Use; and Ido hereby declare that the following is at'ull, clear, and exact descriijition et' the saine, reference being`had to the accompanying drawings, niaking a part ot' this spccilication,in which- Figures l, 2, 3. i, and 5 are elevations ot' 1ny invention,the latter being a sectional elevation taken in the line .c a. Fig. Gisa plan or top view ot' the same. Figs. 7 and S are detached sectionalviews of parts pertaining to the saine, Fig. 7 heilig taken in the liney y, Fig. l, and Fig. 8 in the liue e z, Fig. 6; Fig. 9, a detachedperspective view ot' a part pertaining to the saine.

Similar letters of reference indicate corresponding parts in the severalfigures.

The object ot' this invention is to combine a number ot' parts in such amanner that all the different lathes used by watch-makers may beobtained and used with a single bed-piece and with but one drivingmechanism, the device, as a whole, being at the saine time eX- tremelysimpleand capable of being adjusted and operated with equally as greatfacility as the ordinary lathes in use. Y

To enable those skilled in the art to fully understand and constructmyinvention, I will proceed to describe it.

A represents a bench or table on which the lathe is placed, I3 the wheelby which the mandrel oi" the lathe is driven or rotated, and C thetreadle,which is connected by a rod, D, with a crank, E, at one end ofthe shaft ot' wheel B.

Fis a spring, one end of which is connected to the crank E and theopposite end to the underside o l'the bench A. rlhis spring serves toequalize the rotation of wheel B and assist the crank Il in passing itscenters.

In the top ot' the bench or table A there is made a hole or opening l'orthe band ot' wheel I3 to pass through, and on the top ofthe bench ortable there is permanently secured an annular way,\},' which is of metaland has tit-ted upon it a bell-shaped metal base, H, as shown clearly in7. rlhis base II serves as a support i'or the bedpiece I of the lathe,the latter being attached permanently to the for- Clhe base is securedon its Way G by means ol' a hook, (I, which is Iitted on a screw, K,within the base H, and extends down through the top ofthe bench ortable, and has a pin, L, passing horizontally through it. This inode ot'securing the base II to its way G admits ot' the former being turned onthe latter. rlhe screw Ii may be turned a greater or less distance upwithin the base H,to insure a snug adjustment ofthe base on the way.

rEhe bed-piece I of the lathe is ot rectangular torni in its transversesectioinainl is curved upward at its back end,and has a screw, a.,passing horizontally through it, a janrnut, b, being on the screw, thelatter receiving the back center ot' the mandrel J. The bed-piece I alsohas a vertical bar, c, attached to or cast with it,in the upper part ofwhich is the front bearing ofthe mandrel. (See Figs. 2, 3, and 4.)

\Vhen the invention is used as an ordinary turning-lathe, a rest, Ii, isplaced on the bedpiece Land also a head,L, as shown in Fig. 3, the bandof wheel B passing through the hole or openingin the top ot' the benchor table and around a pulley, d, on the mandrel J.

Vhen the invention is used t'or t'acing off work. the rest K and head Lare removed from the bed-piece I, a chuck, M, secured to the mandrel J,and a sliderest, N, titted on the bedpiece, as shown in Fig. 2.

When the invention is used as a Swiss lathe,77 as they are commonlyltermed, the head L is removed and the rest K placed on the bed'piece,asshown in Fig. 4.

O is a mandrel, which is provided with a dividing-plate orcounter-wheel, I), (see Figs.

l, 5, and 6,) and also provided withv a chuckplate, Q, to which wheelsare connected for cutting gear thereon; and It is a slide which isfitted on the bed-piece I when the mandrel O is used.

On the upper surface ofthe slide R there is secured a dovetail guide, e,which, when the slide It is adjusted on the bed-piece I, is parallelwith the latter. On this guide@ there is titted a plate, j', which isallowed to slide freely back and. forth, and has a frame, S, attached toit by center points, g g, so that it may work or swing freely up anddown,the extent ofthe downward movement being determined or regulated bya set-screw, 7L. In this frame S there is fitted a mandrel, T, on whicha burrcutter, U,is placed, and also a pulleya'. rlhese latter describedparts-to wit, those connected with the frame S-form a gear-cuttingdevice, and in usingit the bed-piece I is turned around one-quarter of arevolution, so as to be in a vertical plane which is parallel withtheplane of the Wheel B and at right angles to its former position. rlheband of the wheel B is also fitted over the pulley t' ofthe mandrel O.and the latter, and consequently the Glitter U, rotated thereby. Thegears are eut by moving forward the frame S, the cutter acting on thelower part of the wheel and the depth of the eut regulated by theset-screw h. After each cut the gear-Wheel is turned a properhdistanceto receive the succeeding cut, the extent ofthe movement beingdetermined by the dividing plate or counter-wheel I? and a pointer stop,j, attached to the bar c of the be l-piece. By this arrangementgears maybe eXpedienlly cut.

The device, as a whole, is extremely simple and ei'eient, and may beadapted to all the different lathe-Work required to be done by aWatch-maker or repairer.

I do not claim the rest K nor the head L, nor the slide-rest N nor chuckM, for these are old and Well-known devices; but

I do claim as new, and desire to secure by Letters Patentl. The inodeofattaching the bed-piece I to the table or bench A,as shown anddescribed to wit, by means of the bell-shaped base H, fitted on theannular Way G,and secured thereto by the screw K, hook J, a-nd pin L,all arranged, as shown, to admit of the turning or adjusting of thebed-piece I on the table or bench.

2. The gear'cutting frame S, provided with the mandrel T, cutter U, andset-screw h, and connected to the sliding plate f by center points,gg,to admit of the rising and falling of said frame and its properadjustment relatively with the wheel to be cut, as set forth.

3. The combination of the mandrels J O with the bed-piece I, restsK N,chuck M, and gear-cutting frame S,all arranged as described, to form anew' and useful lathe, for the purpose herein specified.

EDWARD J. CHAPIN.

Witnesses:

Trios. ORTON, F. B. HoY'r.

